Description of problem:
After updating to version 4.3.3-300 (PAE) weird errors like:
ata2.00: exception Emase 0x0 Sact ...
started appearing, with occasional corruption of files in the filesystem
Version-Release number of selected component (if applicable):
kernel-PAE-core-4.3.3-300.fc23.i686
How reproducible:
The errors above appear in /var/log/messages soon after boot
Additional info:
This problem was addressed and fixed upstream:
https://bugzilla.kernel.org/show_bug.cgi?id=109661
and seems specific to the PAE kernel, so probably it is enough to just update to the new kernel version.

I would like to urge the move of the kernel update from updates-testing to
updates.
The motivation is that most users of PAE kernel, version 4.3.3-300 (there might still be a fair amount of them) will probably experience strange errors even with occasional data corruption on their ATA drive without even knowing that the responsible is the kernel... The only way to fix their problem would be through a regular update!

(In reply to Maurizio Paolini from comment #10)
> I am puzzled... The package disappeared from updates-testing, but it is
> still not
> present in updates. Is this ok?
Yes. It's in the middle of being pushed to stable and the kernel that replaced it (4.3.4-300) also contains the fix. Everything is fine.